[5.x] Exclude jobs from completed overview

[driesvints]

Closes #1153

This PR implements a way to exclude certain jobs from the Horizon completed overview. This is handy to filter frequently shown jobs like PingOhDearJob.

'jobs' => [
    'exclude' => [
        PingOhDearJob::class,
    ],
],

[driesvints]

I managed to crack the changes needed to getJobsByType to properly filter for jobs but now I'm running into an issue with pagination and countJobsByType. Because it returns the count of all jobs, not just the ones filtered by job name, pagination allows you to continue to click to next pages because the total pages count doesn't matches the result set.

We could maybe change countJobsByType to the same inner workings as getJobsByType to retrieve all ids (without mapping them to jobs) to do a full count in PHP of all matching ID's. But this could maybe add a lot of load if there's tons and tons of results.

I'm not sure what the correct way forward is now. If this were a database result set we could just simply do a whereIn 😅

[taylorotwell]

@driesvints we may be approaching this from the wrong angle entirely which is making our life harder than it needs to be.

Another option to achieve the same results would be to either:

A) Not store excluded jobs that complete at all. See the completed method of RedisJobRepository. This is definitely the easiest approach; however, people may still want some way view information about them, which brings me to:

B) Store excluded jobs in a new category of jobs called "Silenced" or something, with a new tab in the UI. This would also likely be a pretty easy change by modifying the completed method and adding a couple of new methods on the RedisJobRepository.

[driesvints]

@taylorotwell great suggestion! I sent this in: #1232